Emmonsite- also known as durdenite, is a mineral with the formula: Fe2(TeO3)3·2(H2O), from Moctezuma, Sonora, Mexico. Field of view: 3.2 mm... http://www.mineral-forum.com/message-board/viewtopic.php?t=384=0=asc=0=aa0f295c7a218b6d7697df1d7a0c95ad